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refrigerant shall use any sources of ignition in such a manner that it may
lead to the risk of fire or explosion. All possible ignition sources, including
cigarette smoking, should be kept sufficiently far away from the site of
installation, repairing, removing and disposal, during which flammable
refrigerant can possibly be released to the surrounding space. Prior to work
taking place, the area around the equipment is to be surveyed to make sure
that there are no flammable hazards or ignition risks. "No Smoking" signs
shall be displayed.
Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before
breaking into the system or conducting any hot work. A degree of
ventilation shall continue during the period that the work is carried out.
The ventilation should safely disperse any released refrigerant and
preferably expel it externally into the atmosphere.
Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the
purpose and to the correct specification. At all times the manufacturer's
maintenance and service guidelines shall be followed. If in doubt consult the
manufacturer's technical department for assistance.
The following checks shall be applied to installations using flammable
refrigerants:
– the charge size is in accordance with the room size within which the
refrigerant containing parts are installed;
– the ventilation machinery and outlets are operating adequately and are
not obstructed;
– if an indirect refrigerating circuit is being used, the secondary circuit shall
be checked for the presence of refrigerant;
– marking to the equipment continues to be visible and legible. Markings
and signs that are illegible shall be corrected;
– refrigeration pipe or components are installed in a position where they
are unlikely to be exposed to any substance which may corrode refrigerant
containing components, unless the components are constructed of materials
which are inherently resistant to being corroded or are suitably protected
against being so corroded.
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